Ansataterrorists utilized a folded-space transporter called the "inverter" in order to carry out their activities without being tracked to their base. They did this despite the device having caused cumulative damage which warped their DNA, resulting in fatal alterations to the cellular chemistry of anyone who used it. The crew of the USS Enterprise-D was eventually able to track the Ansata's movements through use of an adaptive subspace echogram. (TNG: "The High Ground")